glGetMapdv, glGetMapfv, glGetMapiv - return evaluator
parameters

glGetMapdv
	glGetMapdv(target, query) -> values
glGetMapfv
	glGetMapfv(target, query) -> values
glGetMapiv
	glGetMapiv(target, query) -> values

void glGetMapdv( GLenum target,
                 GLenum query,
                 GLdouble *v )
void glGetMapfv( GLenum target,
                 GLenum query,
                 GLfloat *v )
void glGetMapiv( GLenum target,
                 GLenum query,
                 GLint *v )

target  Specifies the	symbolic name of a map.	 Accepted
        values are GL_MAP1_COLOR_4, GL_MAP1_INDEX,
        GL_MAP1_NORMAL, GL_MAP1_TEXTURE_COORD_1,
        GL_MAP1_TEXTURE_COORD_2, GL_MAP1_TEXTURE_COORD_3,
        GL_MAP1_TEXTURE_COORD_4, GL_MAP1_VERTEX_3,
        GL_MAP1_VERTEX_4, GL_MAP2_COLOR_4, GL_MAP2_INDEX,
        GL_MAP2_NORMAL, GL_MAP2_TEXTURE_COORD_1,
        GL_MAP2_TEXTURE_COORD_2, GL_MAP2_TEXTURE_COORD_3,
        GL_MAP2_TEXTURE_COORD_4, GL_MAP2_VERTEX_3, and
        GL_MAP2_VERTEX_4.

query	  Specifies which parameter to return.	Symbolic names
        GL_COEFF, GL_ORDER, and GL_DOMAIN are	accepted.

v	  Returns the requested	data.

glMap1 and glMap2 define evaluators.	glGetMap returns
evaluator parameters.	 target	chooses	a map, query selects a
specific parameter, and v points to storage where the	values
will be returned.

The acceptable values	for the	target parameter are described
in the glMap1	and glMap2 reference pages.

query	can assume the following values:

GL_COEFF	 v returns the control points for the
               evaluator function.  One-dimensional
               evaluators return order control points, and
               two-dimensional evaluators return
               uorderxvorder control points.	Each control
               point consists	of one,	two, three, or four
               integer, single-precision floating-point, or
               double-precision floating-point values,
               depending on the type of the evaluator.  The
               GL returns two-dimensional control points in
               row-major order, incrementing the uorder
               index quickly and the vorder index after each
               row.  Integer values, when requested, are
               computed by rounding the internal floating-
               point values to the nearest integer values.

GL_ORDER	 v returns the order of	the evaluator
               function.  One-dimensional evaluators return
               a single value, order.	The initial value is
               1.  Two-dimensional evaluators	return two
               values, uorder	and vorder. The	initial	value
               is 1,1.

GL_DOMAIN	 v returns the linear u	and v mapping
               parameters.  One-dimensional evaluators
               return	two values, u1 and u2, as specified by
               glMap1.  Two-dimensional evaluators return
               four values (u1, u2, v1, and v2) as specified
               by glMap2.  Integer values, when requested,
               are computed by rounding the internal
               floating-point	values to the nearest integer
               values.

If an	error is generated, no change is made to the contents
of v.

GL_INVALID_ENUM is generated if either target	or query is
not an accepted value.

GL_INVALID_OPERATION is generated if glGetMap	is executed
between the execution	of glBegin and the corresponding
execution of glEnd.

glEvalCoord, glMap1, glMap2